try to fixed pezy#39

ch02/README.md

@@ -550,6 +550,7 @@ Exercise 2.35
 > const auto j2 = i, &k2 = i;
 > ```
 
+-	`i` is `const int`.
 -	`j` is `int`.
 -	`k` is `const int&`.
 -	`p` is `const int *`.

ch02/ex2_35.cpp

@@ -1,19 +1,33 @@
 #include <iostream>
 #include <typeinfo>
 
-int main()
-{
-    const int i = 42;
-    auto j = i;
-    const auto& k = i;
-    auto* p = &i;
-    const auto j2 = i, & k2 = i;
+int main() {
+  const int i = 42;
+  auto j = i;
+  const auto &k = i;
+  auto *p = &i;
+  const auto j2 = i, &k2 = i;
 
-    // print i means int, and PKi means pointer to const int.
-    std::cout << "j is " << typeid(j).name() << "\nk is " << typeid(k).name()
-              << "\np is " << typeid(p).name() << "\nj2 is "
-              << typeid(j2).name() << "\nk2 is " << typeid(k2).name()
-              << std::endl;
+  std::cout << "i  is " << typeid(i).name() << "\n";
+  std::cout << "j  is " << typeid(j).name() << "\n";
+  std::cout << "k  is " << typeid(k).name() << "\n";
+  std::cout << "p  is " << typeid(p).name() << "\n";
+  std::cout << "j2 is " << typeid(j2).name() << "\n";
+  std::cout << "k2 is " << typeid(k2).name() << "\n";
 
-    return 0;
+  std::cout << std::endl;
+  std::cout << std::boolalpha;
+
+  std::cout << "i and j  have same type? "
+            << std::is_same<decltype(i), decltype(j)>::value << "\n";
+  std::cout << "i and k  have same type? "
+            << std::is_same<decltype(i), decltype(k)>::value << "\n";
+  std::cout << "i and j2 have same type? "
+            << std::is_same<decltype(i), decltype(j2)>::value << "\n";
+  std::cout << "j and j2 have same type? "
+            << std::is_same<decltype(j), decltype(j2)>::value << "\n";
+  std::cout << "k and k2 have same type? "
+            << std::is_same<decltype(k), decltype(k2)>::value << "\n";
+
+  return 0;
 }